I would assume it is limited by the vocabulary of the teacher, which it seems at this time has only been given a vocabulary of 100 words. More than likely to keep it in a small range for study, to make easier to find mistakes and correct coding. Once thay feel it is working flawlessly (or as close as anything gets), I am sure they will begin adding more words, which in turn will probably have to be debugged. I am sure you get the picture.
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I would assume it is limited by the vocabulary of the teacher, which it seems at this time has only been given a vocabulary of 100 words. More than likely to keep it in a small range for study, to make easier to find mistakes and correct coding. Once thay feel it is working flawlessly (or as close as anything gets), I am sure they will begin adding more words, which in turn will probably have to be debugged. I am sure you get the picture.